A simple ac bridge for detecting small resistance change

Rev Sci Instrum. 2009 Aug;80(8):086104. doi: 10.1063/1.3202284.

Abstract

A simple ac resistance bridge is proposed. The stability of the design is better than 10(-6), which is especially suitable for detecting tiny changes of resistance. An example of magnetoresistance measurement for a 220 nm Au film shows the good performance of the bridge.